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3D labyrinth for a ball bearing (12 mm or 0.5 inch) Just navigate the ball from the corner with the octagon holes to the spot next to it (with the hexagon hole). Insert the ball during printing !!
3D labyrinth
Order summary

3D labyrinth
Color:
Quantity:
Subtotal
$
Delivery (May 04 - May 06)
Free
Total
$